package com.example.demo5;

import java.sql.*;

public class DBTest {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/library_management?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root"; // 你的数据库用户名
        String password = "131418"; // 你的数据库密码
        String sql ="select * from user where username = ? and password = ?";
        String name="admin";
        String password1="admin123";
        Connection conn = null;
        ResultSet rs =null;
        PreparedStatement prep=null;
        int id=0;
        String email=null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
           conn=  DriverManager.getConnection(url, username, password);

            prep= conn.prepareStatement(sql);
            prep.setString(1,name);
            prep.setString(2,password1);

          rs = prep.executeQuery();

            while(rs.next()){
                 id = rs.getInt(1);
                email = rs.getString(6);
            }

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                rs.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            try {
                prep.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
            try {
                conn.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        System.out.println(id);
        System.out.println(email);

    }
}
